15534421125129 has 27 divisors (see below), whose sum is σ = 22927003500583. Its totient is φ = 10135571744832.

The previous prime is 15534421125079. The next prime is 15534421125137. The reversal of 15534421125129 is 92152112443551.

The square root of 15534421125129 is 3941373.

It is a perfect power (a square), and thus also a powerful number.

15534421125129 is a `hidden beast` number, since 1 + 5 + 53 + 442 + 11 + 25 + 129 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15392479055625 + 141942069504 = 3923325^2 + 376752^2 .

It is not a de Polignac number, because 15534421125129 - 2²¹ = 15534419027977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15534421121129) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 555719617 + ... + 555747569.

Almost surely, 2^{15534421125129} is an apocalyptic number.

15534421125129 is the 3941373-rd square number.

15534421125129 is the 1970687-th centered octagonal number.

It is an amenable number.

15534421125129 is a deficient number, since it is larger than the sum of its proper divisors (7392582375454).

15534421125129 is an frugal number, since it uses more digits than its factorization.

15534421125129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56006 (or 28003 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The spelling of 15534421125129 in words is "fifteen trillion, five hundred thirty-four billion, four hundred twenty-one million, one hundred twenty-five thousand, one hundred twenty-nine".